EN ISO 11961:2008

SLOVENSKI STANDARD
01-januar-2009
1DGRPHãþD
SIST EN ISO 11961:2000
Industrija za predelavo nafte in zemeljskega plina - Jeklene vrtalne cevi (ISO
11961:2008)
Petroleum and natural gas industries - Steel drill pipe (ISO 11961:2008)
Erdöl- und Erdgasindustrie - Stahlrohre zur Verwendung als Bohrrohre - Anforderungen
(ISO 11961:2008)
Industries du pétrole et du gaz naturel - Tiges de forage en acier (ISO 11961:2008)
Ta slovenski standard je istoveten z: EN ISO 11961:2008
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
77.140.75 Jeklene cevi in cevni profili Steel pipes and tubes for
za posebne namene specific use
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 11961
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2008
ICS 75.180.10; 77.140.75 Supersedes EN ISO 11961:1996
English Version
Petroleum and natural gas industries - Steel drill pipe (ISO
11961:2008)
Industries du pétrole et du gaz naturel - Tiges de forage en Erdöl- und Erdgasindustrie - Stahlrohre zur Verwendung als
acier (ISO 11961:2008) Bohrrohre - Anforderungen (ISO 11961:2008)
This European Standard was approved by CEN on 18 October 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11961:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 11961:2008) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum and natural gas industries" in collaboration with Technical
Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum, petrochemical and
natural gas industries” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by May 2009, and conflicting national standards shall be withdrawn at the
latest by May 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11961:1996.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 11961:2008 has been approved by CEN as a EN ISO 11961:2008 without any modification.

INTERNATIONAL ISO
STANDARD 11961
Second edition
2008-11-01
Petroleum and natural gas industries —
Steel drill pipe
Industries du pétrole et du gaz naturel — Tiges de forage en acier

Reference number
ISO 11961:2008(E)
©
ISO 2008
ISO 11961:2008(E)
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ii © ISO 2008 – All rights reserved

ISO 11961:2008(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Conformance. 1
2.1 Dual citing of normative references. 1
2.2 Units of measurement . 2
3 Normative references . 2
4 Terms, definitions, symbols and abbreviated terms. 4
4.1 Terms and definitions. 4
4.2 Symbols and abbreviated terms . 8
5 Information to be supplied when placing orders for drill-pipe . 10
6 Requirements for drill-pipe. 11
6.1 General. 11
6.2 Dimensions, masses and connections. 11
6.3 Material requirements. 12
6.4 Process of manufacture for drill-pipe. 14
6.5 Traceability . 15
6.6 Inspection and testing — General. 15
6.7 Testing of welds. 16
6.8 Tensile test . 16
6.9 Hardness test . 17
6.10 Charpy V-notch impact test . 18
6.11 Transverse side-bend test . 19
6.12 Imperfections and defects in drill-pipe. 19
6.13 Visual inspection of the drill-pipe weld zone.20
6.14 Non-destructive examination of the weld zone . 20
6.15 Marking of drill-pipe. 22
6.16 Minimum facility requirements for drill-pipe manufacturers . 23
6.17 Documentation requirements of drill-pipe . 24
7 Requirements for drill-pipe body . 24
7.1 Information to be supplied when placing orders for drill-pipe bodies. 24
7.2 Dimensional and mass requirements.25
7.3 Material requirements. 27
7.4 Process of manufacture. 28
7.5 Traceability . 28
7.6 Inspection and testing — General. 29
7.7 Testing of chemical composition. 29
7.8 Tensile tests . 30
7.9 Charpy V-notch impact tests . 31
7.10 Drill-pipe-body wall thickness . 32
7.11 Drill-pipe-body length. 32
7.12 Internal upset . 32
7.13 Internal profile . 32
7.14 Straightness . 33
7.15 Upset alignment. 33
7.16 Mass determination . 33
7.17 Imperfections and defects of drill-pipe body. 33
7.18 Visual inspection of drill-pipe body. 34
ISO 11961:2008(E)
7.19 Non-destructive examination. 34
7.20 Marking. 38
7.21 Minimum facility requirements for drill-pipe-body manufacturer. 39
7.22 Documentation requirements . 39
8 Requirements for tool joints . 40
8.1 Information to be supplied when placing orders for tool joints. 40
8.2 Dimensional requirements. 41
8.3 Material requirements. 41
8.4 Process of manufacture . 42
8.5 Traceability . 43
8.6 Inspection and testing — General. 43
8.7 Testing of chemical composition . 43
8.8 Tensile tests. 44
8.9 Hardness tests. 45
8.10 Charpy V-notch impact tests . 45
8.11 Imperfections and defects. 47
8.12 Non-destructive examination. 47
8.13 Marking. 48
8.14 Minimum facility requirements for tool-joint manufacturers. 48
8.15 Documentation requirements for tool joints . 49
Annex A (normative) Tables in SI units. 51
Annex B (normative) Figures in SI (USC) units . 69
Annex C (normative) Tables in USC units . 83
Annex D (normative) Purchaser inspection. 101
Annex E (informative) Supplementary requirements. 102
Annex F (informative) Procedures used to convert from USC units to SI units for drill-pipe . 105
Annex G (normative) Product specification levels . 109
Annex H (informative) API monogram. 111
Bibliography . 112

iv © ISO 2008 – All rights reserved

ISO 11961:2008(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 11961 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 5, Casing, tubing and drill pipe.
This second edition cancels and replaces the first edition (ISO 11961:1996), which has been extensively
technically revised.
It is the intention of ISO/TC 67 that either this edition or the previous edition of ISO 11961 be applicable, at the
option of the purchaser (as defined in 4.1.31), for a period of six months from the first day of the calendar
quarter immediately following the date of publication of this edition, after which period the previous edition will
no longer be applicable.
ISO 11961:2008(E)
Introduction
This International Standard is based on API Spec 5D and API Spec 7.
Users of this International Standard should be aware that further or differing requirements may be needed for
individual applications. This International Standard is not intended to inhibit a vendor from offering, or the
purchaser from accepting, alternative equipment or engineering solutions for the individual application. This
may be particularly applicable where there is innovative or developing technology. Where an alternative is
offered, the vendor should identify any variations from this International Standard and provide details.
This International Standard includes provisions of various natures. These are identified by the use of certain
verbal forms:
a) SHALL is used to indicate that a provision is MANDATORY;
b) SHOULD is used to indicate that a provision is not mandatory, but RECOMMENDED as good practice;
c) MAY is used to indicate that a provision is OPTIONAL.

vi © ISO 2008 – All rights reserved

INTERNATIONAL STANDARD ISO 11961:2008(E)

Petroleum and natural gas industries — Steel drill pipe
1 Scope
This International Standard specifies the technical delivery conditions for steel drill-pipes with upset pipe-body
ends and weld-on tool joints for use in drilling and production operations in petroleum and natural gas
industries for three product specification levels (PSL-1, PSL-2 and PSL-3). The requirements for PSL-1 form
the basis of this International Standard. The requirements that define different levels of standard technical
requirements for PSL-2 and PSL-3 are in Annex G.
This International Standard covers the following grades of drill-pipe:
⎯ grade E drill-pipe;
⎯ high-strength grades of drill-pipe, grades X, G and S.
A typical drill-pipe configuration is given, showing main elements and lengths (see Figure B.1). The main
dimensions and masses of the grades of drill-pipe are given in both SI units (see Table A.1) and in USC units
(see Table C.1).
This International Standard can also be used for drill-pipe with tool joints not specified by ISO or API
standards.
By agreement between purchaser and manufacturer, this International Standard can also be applied to other
drill-pipe body and/or tool-joint dimensions. This International Standard lists supplementary requirements that
can optionally be agreed between purchaser and manufacturer, for testing, performance verification and
non-destructive examination (see Annex E).
This International Standard does not consider performance properties.
NOTE 1 In this International Standard, drill-pipe is designated by label 1, label 2, grade of material (E, X, G and S),
upset type and type of rotary shouldered connection. Designations are used for the purpose of identification in ordering.
NOTE 2 Reference can be made to ISO 10424-2 or API Spec 7-2 for the detailed requirements for the threading of
drill-pipe tool joints.
NOTE 3 Reference can be made to API RP 7G for the performance properties of the drill-pipe.
2 Conformance
2.1 Dual citing of normative references
In the interests of world-wide application of this International Standard, Technical Committee ISO/TC 67 has
decided, after detailed technical analysis, that certain of the normative documents listed in Clause 3 and
prepared by ISO/TC 67 or another ISO Technical Committee are interchangeable in the context of the
relevant requirement with the relevant document prepared by the American Petroleum Institute (API), the
American Society for Testing and Materials (ASTM) and the American National Standards Institute (ANSI).
These latter documents are cited in the running text following the ISO reference and preceded by “or”, for
example “ISO XXXX or API YYYY”. Application of an alternative normative document cited in this manner will
lead to technical results different from the use of the preceding ISO reference. However, both results are
acceptable and these documents are thus considered interchangeable in practice.
ISO 11961:2008(E)
2.2 Units of measurement
In this International Standard, data are expressed in both the International System (SI) of units and the United
States Customary (USC) system of units. Separate tables for data expressed in SI units and USC units are in
Annex A and Annex C, respectively. Figures are in Annex B and express data in both SI and USC units. For a
specific order item, it is intended that only one system of units be used, without combining data expressed in
the other system.
Products manufactured to specifications expressed in either of these unit systems shall be considered
equivalent and totally interchangeable. Consequently, compliance with the requirements of this International
Standard as expressed in one system provides compliance with requirements expressed in the other system.
For data expressed in the SI system, a comma is used as the decimal separator and a space as the
thousands separator. For data expressed in the USC system, a dot (on the line) is used as the decimal
separator and a space as the thousands separator.
In the text, data in SI units are followed by data in USC units in brackets.
NOTE The procedures used to convert from USC units to SI units are given in informative Annex F.
3 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendment) applies.
ISO 6506-1, Metallic materials — Brinell Hardness test — Part 1: Test method
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1:Test method (scales A, B, C, D, E, F, G, H,
K, N, T)
ISO 6892, Metallic materials — Tensile testing
ISO 7500-1, Metallic materials — Verification of static uni-axial testing machines — Part 1:
Tension/compression testing machines — Verification and calibration of the force-measuring system
ISO 9303, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Full
peripheral ultrasonic testing for the detection of longitudinal imperfections
ISO 9304, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Eddy
current testing for the detection of imperfections
ISO 9305, Seamless steel tubes for pressure purposes — Full peripheral ultrasonic testing for the detection of
transverse imperfections
ISO 9402, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Full
peripheral magnetic transducer/flux leakage testing of ferromagnetic steel tubes for the detection of
longitudinal imperfections
ISO 9513, Metallic materials — Calibration of extensometers used in uniaxial testing
ISO 9598, Seamless steel tubes for pressure purposes — Full peripheral magnetic transducer/flux leakage
testing of ferromagnetic steel tubes for the detection of transverse imperfections
ISO/TR 9769, Steel and iron — Review of available methods of analysis
2 © ISO 2008 – All rights reserved

ISO 11961:2008(E)
ISO/TR 10400, Petroleum and natural gas industries — Equations and calculations for the properties of
casing, tubing, drill-pipe and line pipe used as casing or tubing
ISO 10424-2, Petroleum and natural gas industries — Rotary drilling equipment — Part 2: Threading and
gauging of rotary shouldered thread connections
ISO 11484, Steel tubes for pressure purposes — Qualification and certification of non-destructive (NDT)
personnel
ISO 13665, Seamless and welded steel tubes for pressure purposes — Magnetic particle inspection of the
tube body for the detection of surface imperfections
API Spec 7-2, Specification for Threading and Gauging of Rotary Shouldered Thread Connections
API RP 7G, Recommended Practice for Drill Stem Design and Operating Limits
ANSI/API 5C3, Bulletin on Formulas and Calculations for Casing, Tubing, Drill-pipe, and Line Pipe Properties
(including Supplement 1)
ASME Boiler and Pressure Vessel Code, Section IX
ASNT SNT-TC-1A, Recommended Practice, Personnel Qualification and Certification in Non-Destructive
Testing
ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A751, Standard Test Methods, Practices and Terminology for Chemical Analysis of Steel Products
ASTM A941, Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
ASTM E4, Standard Practices for Force Verification of Testing Machines
ASTM E10, Standard Test Method for Brinell Hardness of Metallic Materials
ASTM E18, Standard Test Methods for Rockwell Hardness of Metallic Materials
ASTM E23, Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
ASTM E83, Standard Practice for Verification and Classification of Extensometer Systems
ASTM E92, Standard Test Method for Vickers Hardness of Metallic Materials
ASTM E213, Standard Practice for Ultrasonic Examination of Metal Pipe and Tubing
ASTM E309, Standard Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic
Saturation
ASTM E570, Standard Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
ASTM E709, Standard Guide for Magnetic Particle Testing

ISO 11961:2008(E)
4 Terms, definitions, symbols and abbreviated terms
4.1 Terms and definitions
For the purposes of this document, the terms and definitions in ASTM A941 for heat treatment operations and
the following apply.
4.1.1
bevel diameter
outer diameter of the sealing shoulder of a rotary shouldered connection
4.1.2
defect
imperfection of sufficient magnitude to warrant rejection of the product based on criteria defined in this
International Standard
[ISO 11960:2004, definition 4.1.11]
4.1.3
drill-pipe
drill-pipe body with weld-on tool joints
4.1.4
drill-pipe body
seamless pipe with upset ends
See Figure B.1.
4.1.5
drill-pipe-body manufacturer
firm, company or corporation that operates facilities for making drill-pipe bodies and is responsible for
compliance with the requirements of this International Standard applicable to the drill-pipe body
See 7.21.
4.1.6
drill-pipe manufacturer
firm, company or corporation responsible for compliance with all the applicable requirements of this
International Standard
See 6.16.
4.1.7
drill-pipe torsion-strength ratio
torsion strength of the tool-joint connection divided by the drill-pipe-body torsion strength
4.1.8
drill-pipe weld neck
machined part of the drill-pipe comprising the tool-joint weld neck, the weld and the drill-pipe-body upset
See Figure B.1.
4.1.9
elephant hide
wrinkled outside diameter surfaces of the drill-pipe body caused by the upsetting process
4.1.10
essential variable
variable parameter in which a change affects the mechanical properties of the weld joint
4 © ISO 2008 – All rights reserved

ISO 11961:2008(E)
4.1.11
gouge
elongated groove or cavity caused by mechanical removal of metal
4.1.12
hard banding
application of material onto tool joints to reduce external wear of the tool joint
NOTE Also known as hard facing.
4.1.13
hardness number
result from a single hardness impression
4.1.14
heat
heat of steel
metal produced by a single cycle of a batch-melting process
4.1.15
heat analysis
chemical analysis representative of a heat as reported by the metal producer
[ISO 11960:2004, definition 4.1.15]
4.1.16
imperfection
discontinuity in the product wall or on the product surface that can be detected by an NDE method included in
this International Standard
[ISO 11960:2004, definition 4.1.16]
4.1.17
indication
evidence of a discontinuity that requires interpretation to determine its significance
4.1.18
inspection
process of measuring, examining, testing, gauging or otherwise comparing the product with the applicable
requirements
4.1.19
label 1
dimensionless designation for the drill-pipe-body size that may be used when ordering
4.1.20
label 2
dimensionless designation for the drill-pipe-body mass per unit length that may be used when ordering
4.1.21
linear imperfection
imperfection that includes, but is not limited to, seams, laps, cracks, plug scores, cuts, gouges and elephant
hide
NOTE See API 5T1.
[ISO 11960:2004, definition 4.1.25]
ISO 11961:2008(E)
4.1.22
lot
definite quantity of product manufactured under conditions that are considered uniform for the attribute being
inspected
4.1.23
lot size
number of units in a lot
4.1.24
manufacturer
one or more of the following, depending on the context: the maker of drill-pipe, the maker of drill-pipe body or
the maker of tool joints
4.1.25
mean hardness number
result of averaging the hardness numbers for the single specimen or location being evaluated
4.1.26
non-essential variable
variable parameter in which a change may be made in the WPS without re-qualification
4.1.27
non-linear imperfection
imperfection that includes, but is not limited to, pits
See API Std 5T1.
4.1.28
pipe body
seamless pipe excluding upset and upset-affected areas
See Figure B.1.
4.1.29
procedure qualification record
PQR
written documentation stating an assessment that a specific WPS produces welds in accordance with the
requirements of this International Standard.
4.1.30
product
drill-pipe, drill-pipe body or tool joint
4.1.31
purchaser
party responsible for both the definition of requirements for a product order and for payment for that order
[ISO 11960:2004, definition 4.1.35]
4.1.32
quench crack
crack in steel resulting from stresses produced during the transformation from austenite to martensite
NOTE This transformation is accompanied by an increase in volume.
[ISO 11960:2004, definition 4.1.36]
6 © ISO 2008 – All rights reserved

ISO 11961:2008(E)
4.1.33
rotary shouldered connection
connection used on drill string elements which has tapered threads and sealing shoulders
4.1.34
rotary friction welding
solid state welding under compressive-force contact of work-pieces rotating relative to one another along a
common axis to increase temperature and plastically displace material from the faying surfaces
NOTE Either direct drive or inertia friction welding is acceptable.
4.1.35
sample
one or more units of product selected from a lot to represent that lot
4.1.36
seamless pipe
wrought steel tubular product made without a weld seam
NOTE It is manufactured by hot working and, if necessary, by subsequently cold-working or heat-treating, or a
combination of these operations, to produce the desired shape, dimensions and properties.
[ISO 11960:2004, definition 4.1.37]
4.1.37
tool joint
forged or rolled steel component for drill-pipe designed to be welded to the drill-pipe body and having a rotary
shouldered connection
4.1.38
tool-joint box
threaded connection on tool joints that has internal threads
4.1.39
tool-joint manufacturer
firm, company or corporation that operates facilities for making tool joints and is responsible for compliance
with the requirements of this International Standard applicable to the tool joint
See 8.14.
4.1.40
tool-joint pin
threaded connection on tool joints that has external threads
4.1.41
upset ovality
difference between the largest and smallest diameter in a plane perpendicular to the axis of the upset
4.1.42
weld zone
zone comprising the weld line and the heat-affected areas on either side of the weld line caused by the friction
welding and subsequent heat-treatment processes
4.1.43
welding machine and welding operator performance qualification
WPQ
written procedure used to demonstrate that a welding machine and welding operator combination has the
capability to use the WPS to produce a weld meeting the requirements of this International Standard
NOTE It includes records from the qualification tests.
ISO 11961:2008(E)
4.1.44
welding procedure specification
WPS
written procedure that provides instructions to the welding operator for making production welds in accordance
with the requirements of this International Standard
NOTE It includes all essential variables and non-essential variables for friction welding of tool joints to drill-pipe body.
A WPS applies to all those welds, of which each element has the same specified dimensions and chemistry, that are
grouped according to a documented procedure that ensures a predictable response to weld-zone treatment for a particular
grade.
4.2 Symbols and abbreviated terms
A cross-sectional area of the drill-pipe body based on the specified dimensions of the pipe body
dp
A cross-sectional area of the tensile specimen, expressed in square millimetres (square inches)
A length of reduced section, expressed in millimetres
A minimum cross-sectional area of the weld zone
w
D tool-joint outside diameter (pin and box)
C standard Charpy impact energy, expressed in Joules;
m
C standard Charpy impact energy, expressed in foot-pounds.
D pipe-body outside diameter
dp
D bevel diameter (pin and box)
f
D external diameter on the tool-joint neck, which becomes D after welding and final machining
j te
D diameter of round bar
D outside diameter of the drill-pipe weld after machining
te
D drill-pipe-body upset outside diameter
0u
d pipe-body inside diameter
dp
d internal diameter of the tool-joint neck, which becomes d after welding and final machining
j te
d tool-joint-pin inside diameter
p
d inside diameter of the drill-pipe weld after machining
te
d drill-pipe-body upset inside diameter
0u
EU external upset
e minimum extension in a gauge length of 50,8 mm (2.0 in)
e minimum elongation
m
e drill-pipe-body mass gain or loss due to end finishing. For plain-end non-upset pipe, e equals zero
w w
G gauge length
ID inside diameter
8 © ISO 2008 – All rights reserved

ISO 11961:2008(E)
IEU internal-external upset
IU internal upset
L length of drill-pipe with weld-on tool joint (from shoulder to shoulder)
L length of box-tool joint outside diameter including connection bevel and hard band; see Figures B.1
b
and B.12
L drill-pipe-body external upset length
eu
L drill-pipe-body internal upset length
iu
L length of pin-tool-joint outside diameter, including connection bevel; see Figures B.1 and B.12
pb
L length of drill-pipe body (without tool joint)
pe
m drill-pipe-body external upset taper length
eu
m drill-pipe-body internal upset taper length
iu
N fraction or number with a fraction
NDE non-destructive examination
OD outside diameter
PQR procedure qualification record
PSL product specification level
R minimum radius of fillet
RSC rotary shouldered connection
T tensile strength
S
t pipe-body wall thickness
U upset dimension
U minimum specified tensile strength
dp
UT ultrasonic testing
W width
W approximate calculated mass of a piece of drill-pipe body of length L
L pe
WPQ welder performance qualification
WPS welding procedure specification
w approximate linear mass of the drill-pipe
dp
w plain-end pipe-body unit mass (without upsets)
pe
Y specified minimum yield strength, see Table A.5 or Table C.5
min
Y weld zone yield strength
w
ISO 11961:2008(E)
5 Information to be supplied when placing orders for drill-pipe
5.1 When placing orders for drill-pipe to be manufactured in accordance with this International Standard,
the purchaser shall specify the following on the purchase agreement:
Requirements Reference
Document number(s) ISO 11961 or
API Spec 5 DP
Quantity
Label 1 Table A.1 or Table C.1
Label 2 Table A.1 or Table C.1
Grade Table A.1 or Table C.1
Upset type (internal, external or internal-external upset) Table A.1 or Table C.1
RSC type or other special connection by agreement between purchaser Table A.1 or Table C.1, or 6.2.2
and manufacturer
Range or special length and tolerance by agreement between purchaser Table A.3 or Table C.3
and manufacturer
Delivery date and shipping instructions
Inspection by purchaser Annex D
Documentation 6.17
5.2 The purchaser shall also specify in the purchase agreement his requirements concerning the following
stipulations, which are optional with the purchaser:
Requirements Reference
Tool-joint outside diameter 6.2.2
Tool-joint inside diameter of the pin end 6.2.2
Length of pin-tool-joint outside diameter 6.2.6
Length of box-tool-joint outside diameter 6.2.6
Under-thickness tolerance if less than 12,5 % 7.2.6
Type of heat treatment for drill-pipe body: grade E only 7.4.3
Hard banding: type, location, dimensions and acceptance criteria 8.4.7
NOTE Hard banding reduces the length of the tool-joint outside diameter
available for tong placement.
Pipe coatings: internal and/or external 6.4.5, 6.4.6 and 7.4.4
Special threads on tool joints 8.2.5
Specific thread or storage compound 6.4.7
Thread-protector type 6.4.7 and 8.4.8
Marking requirements 6.15, 7.20 and 8.13
Individual drill-pipe traceability 6.5

10 © ISO 2008 – All rights reserved

ISO 11961:2008(E)
Supplementary requirements
Non-destructive examination for grades E, X and G Clause E.2, SR2
Test certificates Clause E.3, SR15
Charpy V-notch (CVN) impact toughness testing of grade E pipe body Clause E.4, SR19
Alternative low-temperature Charpy V-notch impact testing Clause E.5, SR20
Weld-zone testing frequency Clause E.6, SR23
Charpy V-notch: increased weld-zone requirements Clause E.7, SR24
For PSL-2 or PSL-3 Annex G
6 Requirements for drill-pipe
6.1 General
The drill-pipe shall be made from drill-pipe body manufactured in accordance with Clause 7 and tool joints
manufactured in accordance with Clause 8. Areas of the drill-pipe body and tool joint affected by the welding
and finishing processes are addressed in Clause 6.
6.2 Dimensions, masses and connections
6.2.1 Standard configuration
The configuration of drill-pipe shall correspond to Figure B.1. Drill-pipe shall be furnished with dimensions and
tolerances as in Tables A.1 and A.2 or Tables C.1 and C.2 and/or in the purchase agreement. All dimensions
shown without tolerances are related to the basis for design and are not subject to measurement to determine
acceptance or rejection of product. Drill-pipe dimensions that are not in this International Standard or in the
purchase agreement are at the manufacturer's discretion.
Rotary shouldered connections shall conform to the dimensions, together with the tolerances, in ISO 10424-2
or API Spec 7-2. Right-hand thread connections shall be considered standard.
6.2.2 Alternative configurations
When specified in the purchase agreement, drill-pipe shall be furnished in dimensional configurations not
defined in this International Standard. In this case, dimensions, tolerances and markings shall be agreed
between the purchaser and manufacturer. The drill-pipe body and tool joint shall be modified in accordance
with this agreement but the drill-pipe shall otherwise be manufactured in accordance with the requirements of
this International Standard.
The outside diameter of the box tool joint, D, and inside diameter of the pin tool joint, d , dimensions in
p
Table A.1 or Table C.1, result in a drill-pipe torsion-strength ratio 0,8 or greater. Changes in the OD and ID of
the tool joints can result in a lower drill-pipe torsion-strength ratio, which should be determined by the
purchaser to be suitable for t
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